Apparatus for reducing exposing time of an image processing system

1. Apparatus for reducing exposing time of an image processing system, said image processing system comprising a shift register coupled to a photo-sensing means, said photo-sensing means being used to convert an optical image from a lens to a plurality groups of charge to form an electrical signal, said apparatus comprising: control means for generating a first reset signal and a second reset signal during a first resolution mode and a second resolution mode of said image processing system respectively, a first number of cells of said photo-sensing means being exposed to said optical image during said first resolution mode, a second number of cells of said photo-sensing means being exposed to said optical image during said second resolution mode, said first number of cells of said photo-sensing means being greater than said second number of cells of said photo-sensing means, period of said first reset signal being-proportional to said first number of cells of said photo-sensing means, period of said second reset signal being proportional to said second number of cells of said photo-sensing means, said plurality groups of charge being transmitted to said shift register, and then being output from said shift register; and reset means for leading charges in said shift register to ground responding to said first reset signal and said second reset signal, said reset means coupled to said shift register generating potential-energy well at end of each period of said first reset signal and said second reset signal, said potential-energy well eliminating residual charges left in said shift register, said photo-sensing means converting said optical image to said plurality groups of charge responding to a exposing timing signal, period of said exposing timing signal being no less than period of said first reset signal when said image processing system being in said first resolution mode, period of said exposing timing signal being no less than period of said second reset signal when said image processing system being in said second resolution mode.

2. Apparatus as claim 1 , wherein said image processing system is an image scanner.

3. Apparatus as claim 1 , wherein said reset means is included in a charge coupled device (CCD).

4. Apparatus for converting an optical image through a lens to an electrical signal, said apparatus comprising: photo-sensing means for exposing to light of said optical image to convert said optical image to a plurality groups of charge responding to an exposing timing signal from a exposing timing signal; a shift register for parallel receiving said plurality groups of charge and serially transmitting said plurality groups of charge responding to a shift control signal from a shift control signal source, said serially transmitted plurality groups of charges forming said electrical signal; control means for respectively generating a first reset signal and a second reset signal during a first resolution mode and a second resolution mode of said apparatus, a first number of cells of said photo-sensing means being exposed to light of said optical image during said first resolution mode, a second number of cells of said photo-sensing means being exposed to light of said optical image during said second resolution mode, said first number of cells of said photo-sensing means being greater than said second number of cells of said photo-sensing means, period of said first reset signal being proportional to said first number of cells of said photo-sensing means, period of said second reset signal being proportional to said second number of cells of said photo-sensing means, period of said first reset signal being greater than said second reset signal; and reset means for leading charges in said shift register to ground responding to said first reset signal and said second reset signal, said reset means coupled to said shift register being used to generating potential-energy well at end of each period of said first reset signal and said second reset signal, said potential-energy well eliminating residual charges left in said shift register, said photo-sensing means converting said optical image to said plurality groups of charge responding to said exposing timing signal, period of said exposing timing signal being no less than period of said first reset signal when said image processing system being in said first resolution mode, period of said exposing timing signal being no less than period of said second reset signal when said image processing system being in said second resolution mode.

5. Apparatus as claim 4 further comprising: selection means for determining said apparatus operating in said first resolution mode or in said second resolution mode according to user's selection, the user click on a first position of surface of said selection means to generate a first selection signal, the user click on a second position of surface of said selection means to generate a second selection signal, said apparatus being operated in said first resolution mode according to said first selection signal, said apparatus being operated in said second resolution mode according to said second selection signal; and positioning means for driving said lend to a first image-capturing position responding to said first selection signal to focus said optical image on said first number of cells of said photo-sensing device during said first resolution mode, said positioning means driving said lend to a second image-capturing position responding to said second selection signal to focus said optical image on said second number of cells of said photo-sensing device during said second resolution mode; pre-processing means for adjusting dc voltage of said electrical signal from said shift register as well as converting said electrical signal from analog format to digital format; and post processing means for adjusting contrast of said electrical signal of digital format.

6. Apparatus as claim 5 , wherein said selection means is a software interface.

7. Apparatus as claim 5 , wherein said positioning means is a driving motor.

8. Apparatus as claim 4 , wherein said reset gate is included in a charge coupled device (CCD).

9. Apparatus for converting an optical image through a lens to an electrical signal, said apparatus comprising: photo-sensing means for exposing to light of said optical image to convert said optical image to a plurality groups of charge responding to an exposing timing signal from a exposing timing signal source; a shift register for parallel receiving said plurality groups of charge and serially transmitting said plurality groups of charge responding to a shift control signal from a shift control signal source, said serially transmitted plurality groups of charges forming said electrical signal; control means for respectively generating a first reset signal and a second reset signal during a first resolution mode and a second resolution mode of said apparatus, a first number of cells of said photo-sensing means being exposed to light of said optical image during said first resolution mode, a second number of cells of said photo-sensing means being exposed to light of said optical image during said second resolution mode, said first number of cells of said photo-sensing means being greater than said second number of cells of said photo-sensing means, period of said first reset signal being proportional to said first number of cells of said photo-sensing means, period of said second reset signal being proportional to said second number of cells of said photo-sensing means, period of said first reset signal being greater than said second reset signal; reset means for leading charges in said shift register to ground responding to said first reset signal and said second reset signal, said reset means coupled to said shift register being used to generating potential-energy well at end of each period of said first reset signal and said second reset signal, said potential-energy well eliminating residual charges left in said shift register, said photo-sensing means converting said optical image to said plurality groups of charge responding to said exposing timing signal, period of said exposing timing signal being no less than period of said first reset signal when said image processing system being in said first resolution mode, period of said exposing timing signal being no less than period of said second reset signal when said image processing system being in said second resolution mode; selection means for determining said apparatus operating in said first resolution mode or in said second resolution mode according to user's selection, the user click on a first position of surface of said selection means to generate a first selection signal, the user click on a second position of surface of said selection means to generate a second selection signal, said apparatus being operated in said first resolution mode according to said first selection signal, said apparatus being operated in said second resolution mode according to said second selection signal; positioning means for driving said lend to a first image-capturing position responding to said first selection signal to focus said optical image on said first number of cells of said photo-sensing device during said first resolution mode, said positioning means driving said lens to a second image-capturing position responding to said second selection signal to focus said optical image on said second number of cells of said photo-sensing device during said second resolution mode.

10. Apparatus as claim 9 further comprising: pre-processing means for adjusting dc voltage of said electrical signal from said shift register as well as converting said electrical signal from analog format to digital format; and post processing means for adjusting contrast of said electrical signal of digital format.

11. Apparatus as claim 9 , wherein said selection means is a software interface.

12. Apparatus as claim 9 , wherein said positioning means is a driving motor.

13. Apparatus as claim 9 , wherein said reset gate is included in a charge coupled device (CCD).